Draft device for chimneys



' May 22, 1923;.

L DUFEK DRAFT DEVICE FOR CHIMNEYS" Filed April 4, i922 \NYENTOR Lou \& \DuFE-K (WWW.

*r-ronngy UNATEITB LOUIS DUFEK, OF TACOIK'TA, WASHINGTON.

DRAFT DEVICE FDR GI-IIIVINEYS.

Application filed. April 4, 1922.

To all 1072,0722 it may concern.

Be it known that I, LOUIS DUFEK, a citizen of the Czechoslovakia- Bepublic, residing at Tacoma, in the county of Pierce and State of Washington, have invented a new and useful Draft Device for Chimneys, of which the following is a specification.

My invention has reference to improvements in draft devices for chimneys, wherein I utilize outside air currents as well as the products of combustion issuing from the chimney to increase the draft of same; and the objects of my invention are, to provide a spider, suitably mounted on the top of a chimney, carrying a plurality of concavo-convex cups, adapted to rotate by the action of said air currents, a pair of said cups terminating in downwardly extending reversely curved blades, oppositely disposed. which communicate with the chimney and are designed to also rotate by the draft caused by the chimney and the stove connected therewith; said instrumentalities creating a suction which causes the chimney to draw in a better way.

In the accompanying drawings- Figure 1 is an elevation of the device as attached to a length of pipe, the body being shown in vertical section and the pipe partly broken away.

Fig. 2, a top plan view of the same, with the canopy and its connecting supports removed.

Chimneys for the use of cooking stoves in dwelling houses, located as they usually are in the back and lower portion. of the dwelling, many times afford insufficient draft, on account of the short length of the chimney and the-obstruction furnished by the front portion of the building. To increase the draft, and to keep the smoke away from the roof as much as possible, the well known practice has been to lengthen the chimney by adding on a pipe as an. extension. In the embodiment of the invention shown in Fig. 1, the device is attached to a section of such pipe. Obviously it can be attached to a chimney through a hood, or in any other suitable manner, should an extension pipe be unnecessary for the chimney to which it is to be applied.

In the drawings 1 denotes a section of said pipe, 2 a flared body portion attached thereto, and 3 anchor brackets for the canopy 4 and the transverse bracket 5. This latter bracket provides an upper pivotal Serial No. 549,497.

connection 6 for the shaft 7, the lower transverse bracket 8 affording a pivotal connection 9 for the lower end of said shaft.

A spider 10, attached to the shaft and rotatable therewith, carries pair of op positely disposed concavo-convex cups 11, located in reversed relation, each terminating in a downwardly extendingreversely curved blade, gradually diminishing in width toward its free end to lessen the weight of same and to present little obstruction, if any, to the adjacent open end of the pipe. To afford a more stable structure, these blades are connected at their medial portions by the support 12. The other arms of the spider carry a pair of cups 13, oppositely disposed and likewise in reversed position.

The brackets 3 are of light construction to permit free action of the air currents on the cups, which, located as described, are designed to catch the air currents coming from any direction. The parts are evenly balanced and the bearings of the shaft pre sent frictional contacts which are sensitive and which permit the rotation of the spider, shaft, cups and blades under a moderate impelling force. and heated air from the chimney on the blades, owing to their curvature and location, also contribute to the rotation of the same.

The primary actuating power of the device resides in the cups, and the action of air currents thereon, however, the blades also aid in this movement, as above described, all cooperating to exercise a suction effect which will accelerate the upward movement of the products of combustion. from the chimney. The flared body of the device performs a useful function, in that it affords room for the blades, and their free movement, without materially reducing the outlet of the chimney.

I claim:

1. A device of the class described. comprising a body, a vertical shaft pivoted in supports therefor, a spider fixedly connected with the shaft and rotatable above the body, a member at the outer terminal of each arm of the spider adapted to en gage air currents, a pair of said members, oppositely disposed, each having a downwardly extending reversely curved blade, and means for mounting said device to a chimney, whereby the lower terminals of The action of the smoke said blades will be located adjacent the out-- let thereof. I

2. A device of the class describ'echcomprising a flared body, a canopy spaced above the body, supports therefor, a pair of brackets, a vertical sha'lit pivoted to said brackets and in axial alignment with the body, a spider fixedly attached to the shaft and rotatable between the canopy and the body, a concave-convex cupvertically disposed'and in reversed relation at the outer terminal of each arm of the spider, a pair of said cups, oppositely disposed,being provided each with a downwardly extending reversely curved blade gradually diminishing in width toward itsfree end; each of said ends adapted to rotate adjacent the walls of the body, a connecting brace for said to a chimney.

3. In a device of the class described, the combination of a vertical shaft, pivotal connectionstherefor, a spider fixedly attached to the shaft, a concavo-convex cup vertically disposed and in reversed relation at the outer terminal of each arm of the spider, a

pair of saidscups, oppositely located, being provided each with a downwardly extending reversely curved blade. v

LOUIS 'DUFEK.

blades, and means for attaching ithe device 

